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Environmental Engineering Research 2002;7(3): 177-184. DOI: https://doi.org/10.4491/eer.2002.7.3.177
A DEVELOPMENT OF A NOVEL THERMAL DESORPTION TECHNIQUE FOR MEASUREMENT OF VOCS IN AMBIENT AIR
Gang Woong Lee1, Jo-Chun Kim2, Hee-Nam Song3, Jong Hwan Kim3, Jin-Seok Han4, and Jin-Ho Shin1
1Department of Environmental Sciences, Hankook University of Foreign Studies, Yongin 449-791, Korea
2Department of Environmental Engineering, Dongshin University, Naju 520-714, Korea
3Donam Instruments Inc., Seongnam 462-110, Korea
4National Institute of Environmental Research, Inchun 404-170, Korea
Corresponding Author: Jo-Chun Kim ,Tel: +82-61-330-3162, Fax: +82-61-330-2909, Email: jckim@white.dsu.ac.kr
Received: August 7, 2002;  Accepted: August 22, 2002.
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ABSTRACT
The most demanding task for the continuous and long-term on-line measurement of volatile organic compounds (VOCs) is the minimization of test sample loss and the preconcentration of the trace gases. While the cryogenic preconcentration method produces excellent chromatographic results, it requires an extremely costly liquefying apparatus and cryogens. In a conventional thermal desorption method, poor chromatographic resolution due to a large amount of elution volume for complete extraction of samples on adsorbent is the main disadvantage, causing relatively low sensitivity. In this study, a novel thermal desorption system with a special syringe pump and a peltier cooling element, which can lower sampling temperature down to -30 °C, was developed for VOC preconcentration and introduction. A nafion dryer was used optionally for removing water vapor. It was concluded that this novel thermal desorption system performed equivalently to the commercially available state-of-the-art cryogenic sample preconcentration system, and revealed even better separation capability.
Keywords: nafion dryer | peltier trap | preconcentration | thermal desorption | VOC
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